Depends on what is important to you. 4GLTE is blazing fast compared to 3g in my area. If you live in an area that isn't heavily loaded on the tower, then it might not make a huge difference. and 4" to 4.3" is noticable. The rezound also has an HD screen.
I went from the thunderbolt to the rezound and thought that it was worth it for me, so if I had the dinc2, it would most definitely be worth it for the larger and HD screen. But what's important to me might not be important to you. You can try to go to the store and see what you think.